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EP2855168B1 - Foldable tyre, method and use - Google Patents

Foldable tyre, method and use Download PDF

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Publication number
EP2855168B1
EP2855168B1 EP13723116.3A EP13723116A EP2855168B1 EP 2855168 B1 EP2855168 B1 EP 2855168B1 EP 13723116 A EP13723116 A EP 13723116A EP 2855168 B1 EP2855168 B1 EP 2855168B1
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EP
European Patent Office
Prior art keywords
tyre
tire
rotation
collapsed
plane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP13723116.3A
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German (de)
French (fr)
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EP2855168A1 (en
Inventor
Luc Bestgen
Florian VILCOT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Michelin Recherche et Technique SA Switzerland
Compagnie Generale des Etablissements Michelin SCA
Original Assignee
Michelin Recherche et Technique SA Switzerland
Compagnie Generale des Etablissements Michelin SCA
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Publication date
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Publication of EP2855168A1 publication Critical patent/EP2855168A1/en
Application granted granted Critical
Publication of EP2855168B1 publication Critical patent/EP2855168B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C3/00—Tyres characterised by the transverse section
    • B60C3/08—Tyres characterised by the transverse section collapsible into storage or non-use condition, e.g. space-saving spare tyres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C25/00—Apparatus or tools adapted for mounting, removing or inspecting tyres
    • B60C25/14—Apparatus or tools for spreading or locating tyre beads

Definitions

  • the invention relates to a foldable tire, a folding method and a use for a passenger vehicle.
  • a tire comprises a tread intended to come into contact with the ground via a rolling surface, extending radially inwards by two sidewalls connected to two beads intended to ensure the connection of the tire with a rim .
  • a radial tire more particularly comprises a reinforcing reinforcement comprising a crown reinforcement, radially internal to the reinforcement strip. rolling, and a radial carcass reinforcement, radially inside the crown reinforcement.
  • the carcass reinforcement usually comprises at least one layer of reinforcing elements consisting of wires substantially parallel to each other and usually forming, with the circumferential direction, an angle of between 85 ° and 95 °.
  • the carcass reinforcement winds in most of the tires in each bead from the inside to the outside of the tire, around a circumferential reinforcing element, called a bead wire, to form a reversal.
  • the rod may be formed of an assembly of elementary son or cables, themselves formed of an assembly of elementary son.
  • the vertex frame usually includes several layers of crown reinforcement. These layers are most often made of metal reinforcing elements embedded in an elastomeric material.
  • the thickness of the crown reinforcement consisting essentially of the radial stacking of the crown reinforcement and the carcass reinforcement is usually between 2 and 7 mm.
  • a tire sidewall for a passenger vehicle generally has a thickness of between 2.6 and 7 mm.
  • the cross-carcass tire is distinguished from a radial tire by the presence of at least two crossed carcass plies whose angle is different from 90 ° with respect to the circumferential direction of the tire.
  • Tablecloths are said to be “crossed” because the angles are of opposite signs from one tablecloth to another.
  • WO10 / 100088 a foldable tire for a bicycle comprising a carcass reinforcement, each end of which is anchored in two beads by turning around a reinforcement element, called a bead wire. Each bead is extended radially by flanks joining a tread.
  • This pneumatic device comprises a rod formed by winding a saturated and unfrowned metal cable formed of filaments.
  • a foldable tire mounted on a rim, for vehicles, such as automobiles.
  • This tire comprises a substantially annular tread centrally located, and sidewalls extending the tread and ending in inextensible beads, that is to say whose bead has a high circumferential rigidity.
  • the sidewalls When the tire is deflated, the sidewalls may be folded inwardly toward each other so as to be substantially flattened within the tire with respect to the tread.
  • a mode of packaging currently used consists first of all to arrange vertically and linearly a first row of tires forming an angle of inclination with the ground so as to partially overlap. Other tires are then incorporated and driven into the part of the port left free of each tire of the first row, thus forming a second row.
  • Such a mode of packaging makes it possible to add 30% of tire per m 3 in addition to a storage in which the tires are arranged side by side without deformation.
  • the subject of the invention is a foldable tire for a vehicle comprising at least one carcass reinforcement possibly associated with an inextensible crown reinforcement, itself radially inside a tread, said reinforcement being each composed of at least one layer of reinforcing elements, said tread being connected to two beads by means of two sidewalls, said beads being intended to come into contact with a rim, each bead including at least one inextensible circumferential reinforcing element, called rod, said rod defining an average line forming a substantially circular closed curve in a circumferential plane, said sidewalls having a thickness of between 2.6 and 7 mm and said crown reinforcement having a thickness of between 2 and 7 mm.
  • the tire is characterized in that the bead wire of each bead is flexible, and in that after bending of the tire the mean bead line simultaneously defines a first bend defined in the equatorial plane having a first pitch of a helix rotating in the trigonometric direction in the axial plane, and a second curvature defined in said equatorial plane having a second helical pitch rotating in the antitrigonometric direction in said axial plane, the first and second curvatures being interconnected by a third connection curvature defined in said equatorial plane, the projection of said first, second and third curvatures of the folded tire, on an axial plane defining the two-dimensional space of said tire folded by a total perimeter P less than or equal to [3x (2H + A) H] being the height sidewall and the width of the tire.
  • a bead wire is said to be flexible when, bent in its plane around a pulley of radius 10 mm, none of the rigid elements constituting it reaches a permanent deformation.
  • a crown reinforcement is inextensible when the force, to deform it by 5%, is at least equal to 40N, and a bead wire is inextensible when the force, to lengthen it by 1%, is at less than 2500N.
  • the tire according to the invention has the advantage of being able to significantly increase the number of tires per unit volume during transport and / or storage, thus resulting in a significant economic gain.
  • the folding mode according to the invention allows tire storage with a gain ranging from 30 to 50% per m 3, in particular with respect to the chaining type conditioning mode, explained above.
  • the tire according to the invention can be folded, and stored in bulk or arranged in a box.
  • Another advantage of the tire of the invention is that it can be submitted and kept folded, regardless of its size. Finally, the tire according to the invention can remain folded during its transport and / or storage without any negative impact on its performance.
  • the absolute value of the addition of the first angle and the possible second angle of rotation is preferably between 300 ° and 360 °. This is equivalent to a variation between 5/6 and 6/6 of the first and / or second helix pitch.
  • the invention has the final object of using the tire as defined previously for a passenger vehicle.
  • the first and second helical pitch of said first and second curvatures are the same or different.
  • the first and second helical pitch may be between 75 and 125% of the tire diameter. These percentage values are preferably obtained at the average line of the bead wire.
  • the tire according to the invention comprises a holding means in the folded position.
  • the folding method further comprises applying at least one folded position holding means, which is preferably applied to the center of the tire.
  • This means can be constituted by a strap or a strapping strap.
  • the figure 1 represents a passenger vehicle tire, of general reference 1, not folded comprising a tread 2 which extends radially inwards by two sidewalls 3 connected to two beads 4, said beads 4 comprising a bead wire (reinforcing element) (not shown)
  • Each bead 4 comprises at least one bead wire.
  • This rod which defines a mean line forming a substantially circular closed curve in a circumferential plane, is inextensible and flexible.
  • the bead wire is preferably made of steel, and is in the form of a saturated and unfilled cable, formed of filaments; said filaments being of a diameter equal to 0.18mm.
  • the cable is a 19.18 metal cable of formula (1 + 6 + 12), the layers being formed with the same direction of rotation and with identical pitch equal to 10 mm. Such a cable allows the formation of a rod by a winding of 3 to 16 turns. The number of turns required is a function of the size of the tire and its use.
  • the average thickness E F of the sidewall of the tire according to the invention measured at the point situated in the middle in the radial direction between the high point of the bead wire and the low point of the tire on the equatorial plane, is between 2.6 and 7mm.
  • the average thickness E S of the crown reinforcement 4, measured at the equatorial plane, is between 2 and 7 mm.
  • the figure 2 shows a tire, for example of commercial reference 185/65 R 14, whose folding has been initiated, and the figure 3 shows the same tire after folding.
  • the folding of the tire is carried out by first grasping two ends, comprising a portion of the tread 2 and a portion of the sidewalls 3, said ends being diametrically opposite and located on the axis XX ', said corresponding axis XX' to the tire diameter and passing through its center.
  • the first rotation has a first angle and the second rotation has a second angle.
  • the addition of the absolute values of the first and second angles is preferably 300 °.
  • the average line of the rod (reinforcing element) present in the bead 4 then simultaneously defines a first curvature, of general reference 5 defined in the equatorial plane, with a first pitch of 61cm rotating in the direction triginometric in the axial plane, and a second curvature, of general reference 6 defined in the equatorial plane, with a second pitch of 65cm rotating in the antitriginometric direction in the axial plane.
  • the axial planes A and C are, respectively, substantially disposed at the first curvature 5 and the second curvature 6, and are perpendicular to the axis XX '.
  • the axial plane B, perpendicular to the axis XX ', is substantially disposed at the level of the third curvature 7.
  • each of the axial planes A, B and C makes it possible to define a two-dimensional space of the tire after its folding according to the invention.
  • This size is defined by projecting on each axial plane A, B and C the entire corresponding cavity at the location of said plane of the folded tire. From these impressions are extracted only all the convex parts relating to the folded tire.
  • the figure 5 represents the two-dimensional space of all the convex portions extracted and projected on each axial plane A, B and C of the folded tire. As can be seen in this figure, this size has a substantially rectangular shape.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Description

L'invention concerne un pneumatique pliable, un procédé de pliage et une utilisation pour véhicule de tourisme.The invention relates to a foldable tire, a folding method and a use for a passenger vehicle.

Dans ce qui suit, on désigne par :

  • « plan circonférentiel» : un plan perpendiculaire à l'axe de rotation du pneumatique,
  • « plan équatorial » : un plan circonférentiel passant par le milieu de la surface de roulement du pneumatique et,
  • « plan axial » : un plan qui contient l'axe de rotation du pneumatique,
  • « direction axiale » : direction parallèle à l'axe de rotation du pneumatique,
  • « direction radiale » : une direction coupant l'axe de rotation du pneumatique et perpendiculaire à celui-ci,
  • « direction circonférentielle » : une direction tangente à la surface de la bande de roulement selon le sens de rotation du pneumatique,
  • « radialement intérieur à » : plus proche de l'axe de rotation du pneumatique,
  • « radialement extérieur à »: plus éloigné de l'axe de rotation du pneumatique.
  • « axialement intérieur à » : plus proche du plan équatorial,
  • « axialement extérieur à » : plus éloigné du plan équatorial.
In the following, we denote by:
  • "Circumferential plane": a plane perpendicular to the axis of rotation of the tire,
  • 'Equatorial plane' means a circumferential plane passing through the middle of the running surface of the tire and,
  • "Axial plane": a plane which contains the axis of rotation of the tire,
  • "Axial direction": direction parallel to the axis of rotation of the tire,
  • "Radial direction": a direction intersecting the axis of rotation of the tire and perpendicular thereto,
  • "Circumferential direction": a direction tangent to the surface of the tread in the direction of rotation of the tire,
  • "Radially inner to": closer to the axis of rotation of the tire,
  • "Radially outside": further from the axis of rotation of the tire.
  • "Axially inner to": closer to the equatorial plane,
  • "Axially outside": further from the equatorial plane.

Un pneumatique comprend une bande de roulement destinée à venir en contact avec le sol par l'intermédiaire d'une surface de roulement, se prolongeant radialement vers l'intérieur par deux flancs reliés à deux bourrelets destinés à assurer la liaison du pneumatique avec une jante.A tire comprises a tread intended to come into contact with the ground via a rolling surface, extending radially inwards by two sidewalls connected to two beads intended to ensure the connection of the tire with a rim .

Un pneumatique radial comprend plus particulièrement une armature de renforcement comprenant une armature de sommet, radialement intérieure à la bande de roulement, et une armature de carcasse radiale, radialement à l'intérieur de l'armature de sommet.A radial tire more particularly comprises a reinforcing reinforcement comprising a crown reinforcement, radially internal to the reinforcement strip. rolling, and a radial carcass reinforcement, radially inside the crown reinforcement.

L'armature de carcasse comprend habituellement au moins une couche d'éléments de renforcement constitué de fils sensiblement parallèles entre eux et faisant habituellement, avec la direction circonférentielle un angle compris entre 85° et 95°. L'armature de carcasse s'enroule dans la plupart des pneumatiques dans chaque bourrelet de l'intérieur vers l'extérieur du pneumatique, autour d'un élément de renforcement circonférentiel, appelé tringle, pour former un retournement. La tringle peut être formée d'un assemblage de fils élémentaires ou de câbles, eux-mêmes formés d'un assemblage de fils élémentaires.The carcass reinforcement usually comprises at least one layer of reinforcing elements consisting of wires substantially parallel to each other and usually forming, with the circumferential direction, an angle of between 85 ° and 95 °. The carcass reinforcement winds in most of the tires in each bead from the inside to the outside of the tire, around a circumferential reinforcing element, called a bead wire, to form a reversal. The rod may be formed of an assembly of elementary son or cables, themselves formed of an assembly of elementary son.

L'armature de sommet comprend généralement plusieurs couches d'armature de sommet. Ces couches sont le plus souvent constituées d'éléments de renforcement métalliques noyés dans un matériau élastomérique.The vertex frame usually includes several layers of crown reinforcement. These layers are most often made of metal reinforcing elements embedded in an elastomeric material.

Dans le cas d'un pneumatique pour véhicule de tourisme, l'épaisseur de l'armature de sommet, constituée essentiellement par l'empilage radial de l'armature de sommet et de l'armature de carcasse est habituellement comprise entre 2 et 7mm. Un flanc de pneumatique pour véhicule de tourisme a généralement une épaisseur comprise entre 2,6 et 7mm.In the case of a tire for a passenger vehicle, the thickness of the crown reinforcement, consisting essentially of the radial stacking of the crown reinforcement and the carcass reinforcement is usually between 2 and 7 mm. A tire sidewall for a passenger vehicle generally has a thickness of between 2.6 and 7 mm.

Le pneumatique à carcasse croisée se distingue d'un pneumatique de technologie radial par la présence d'au moins deux nappes carcasse croisées dont l'angle est différent de 90° par rapport à la direction circonférentielle du pneumatique. Les nappes sont dites « croisées » parce que les angles sont de signes opposés d'une nappe à l'autre.The cross-carcass tire is distinguished from a radial tire by the presence of at least two crossed carcass plies whose angle is different from 90 ° with respect to the circumferential direction of the tire. Tablecloths are said to be "crossed" because the angles are of opposite signs from one tablecloth to another.

Il est déjà connu du document WO10/100088 un pneumatique pliable pour bicyclette comprenant une armature de carcasse dont chaque extrémité est ancrée dans deux bourrelets par retournement autour d'un élément de renfort, appelé tringle. Chaque bourrelet est prolongé radialement par des flancs rejoignant une bande de roulement. Ce pneumatique comprend une tringle formée par enroulement d'un câble métallique saturé et non fretté, formé de filaments.It is already known from the document WO10 / 100088 a foldable tire for a bicycle comprising a carcass reinforcement, each end of which is anchored in two beads by turning around a reinforcement element, called a bead wire. Each bead is extended radially by flanks joining a tread. This pneumatic device comprises a rod formed by winding a saturated and unfrowned metal cable formed of filaments.

Il est par ailleurs connu du document FR 2,348,065 un pneumatique pliable, monté sur jante, pour des véhicules, tels que des automobiles. Ce pneumatique comporte une bande de roulement sensiblement annulaire située centralement, et des flancs prolongeant la bande de roulement et se terminant par des bourrelets inextensibles, c'est-à-dire dont la tringle a une rigidité circonférentielle élevée. Lorsque le pneumatique est dégonflé, les flancs peuvent être pliés vers l'intérieur l'un vers l'autre de manière à être pratiquement aplatis à l'intérieur du pneumatique par rapport à la bande de roulement.It is also known from the document FR 2,348,065 a foldable tire, mounted on a rim, for vehicles, such as automobiles. This tire comprises a substantially annular tread centrally located, and sidewalls extending the tread and ending in inextensible beads, that is to say whose bead has a high circumferential rigidity. When the tire is deflated, the sidewalls may be folded inwardly toward each other so as to be substantially flattened within the tire with respect to the tread.

Enfin, le document US 4,057,091 divulgue encore le pliage d'un pneumatique pour véhicule automobile lorsqu'il est monté sur une jante. Dans une telle combinaison, et lorsqu'il est dégonflé, le pneumatique peut être aplati par repliement interne de ses flancs sur eux-mêmes vers cette jante.Finally, the document US 4,057,091 discloses again the folding of a tire for a motor vehicle when mounted on a rim. In such a combination, and when deflated, the tire can be flattened by internal folding of its flanks on themselves towards this rim.

Mais de telles configurations de pliage de pneumatique pour véhicule automobile tiennent compte de la présence permanente de la jante, et conservent malgré tout un encombrement important, et un poids élevé du fait de la présence de la jante.But such tire bending configurations for a motor vehicle take into account the permanent presence of the rim, and still retain a large footprint, and a high weight due to the presence of the rim.

Par ailleurs, lorsque les pneumatiques sont fabriqués sur des lieux de productions éloignés des lieux de vente, il est nécessaire de les transporter. Lors de leur transport, même s'ils sont comprimés ensemble, les pneumatiques occupent encore un volume important.Furthermore, when the tires are manufactured on production sites away from sales points, it is necessary to transport them. During transport, even if they are compressed together, the tires still occupy a large volume.

En effet, un mode de conditionnement utilisé actuellement consiste tout d'abord à disposer verticalement et linéairement une première rangée de pneumatiques formant un angle d'inclinaison avec le sol de manière à les superposer partiellement. D'autres pneumatiques sont ensuite incorporés et enfoncés dans la partie de l'orifice laissée libre de chaque pneumatique de la première rangée, formant ainsi une seconde rangée. Un tel mode de conditionnement permet d'ajouter 30% de pneumatique par m3 en plus par rapport à un rangement dans lequel les pneumatiques sont disposés côte à côte sans déformation.Indeed, a mode of packaging currently used consists first of all to arrange vertically and linearly a first row of tires forming an angle of inclination with the ground so as to partially overlap. Other tires are then incorporated and driven into the part of the port left free of each tire of the first row, thus forming a second row. Such a mode of packaging makes it possible to add 30% of tire per m 3 in addition to a storage in which the tires are arranged side by side without deformation.

Aussi il subsiste le besoin de pouvoir conditionner un ou plusieurs pneumatiques, de type radial ou de type à carcasse croisée, pour véhicule automobile, non montés sur jante, de manière plus ou moins compacte, le temps de leur transport et/ou de leur stockage, sans endommager leur structure interne, tout en leur permettant de retrouver très rapidement leur forme initiale après dépliage et gonflage.There remains the need to be able to condition one or more tires, radial type or cross-carcass type, for a motor vehicle, not mounted on rim, in a more or less compact way, the time of their transport and / or storage , without damaging their internal structure, while allowing them to recover very quickly their initial shape after unfolding and inflation.

L'invention a pour objet un pneumatique pliable pour véhicule comportant au moins une armature de carcasse associée éventuellement à une armature de sommet inextensible, elle-même radialement à l'intérieur d'une bande de roulement, lesdites armatures étant chacune constituées d'au moins une couche d'éléments de renforcement, ladite bande de roulement étant reliée à deux bourrelet par l'intermédiaire de deux flancs, lesdits bourrelets étant destinés à entrer en contact avec une jante, chaque bourrelet comportant au moins un élément de renforcement circonférentiel inextensible, appelé tringle, ladite tringle définissant une ligne moyenne formant une courbe fermée sensiblement circulaire dans un plan circonférentiel, lesdits flancs présentant une épaisseur comprise entre 2,6 et 7 mm et ladite armature de sommet présentant une épaisseur comprise entre 2 et 7mm.The subject of the invention is a foldable tire for a vehicle comprising at least one carcass reinforcement possibly associated with an inextensible crown reinforcement, itself radially inside a tread, said reinforcement being each composed of at least one layer of reinforcing elements, said tread being connected to two beads by means of two sidewalls, said beads being intended to come into contact with a rim, each bead including at least one inextensible circumferential reinforcing element, called rod, said rod defining an average line forming a substantially circular closed curve in a circumferential plane, said sidewalls having a thickness of between 2.6 and 7 mm and said crown reinforcement having a thickness of between 2 and 7 mm.

Le pneumatique se caractérise en ce que la tringle de chaque bourrelet est flexible, et en ce qu'après pliage du pneumatique la ligne moyenne de la tringle définit simultanément une première courbure définie dans le plan équatorial ayant un premier pas d'hélice tournant dans le sens trigonométrique dans le plan axial, et une seconde courbure définie dans ledit plan équatorial ayant un second pas d'hélice tournant dans le sens antitrigonométrique dans ledit plan axial, les premières et secondes courbures étant reliées entre elles par une troisième courbure de raccordement définie dans ledit plan équatorial, la projection desdites première, seconde et troisième courbures du pneumatique plié, sur un plan axial définissant l'encombrement bidimensionnel dudit pneumatique plié par un périmètre total P inférieur ou égal à [3x(2H+A) H] étant la hauteur de flanc et A la largeur du pneumatique.The tire is characterized in that the bead wire of each bead is flexible, and in that after bending of the tire the mean bead line simultaneously defines a first bend defined in the equatorial plane having a first pitch of a helix rotating in the trigonometric direction in the axial plane, and a second curvature defined in said equatorial plane having a second helical pitch rotating in the antitrigonometric direction in said axial plane, the first and second curvatures being interconnected by a third connection curvature defined in said equatorial plane, the projection of said first, second and third curvatures of the folded tire, on an axial plane defining the two-dimensional space of said tire folded by a total perimeter P less than or equal to [3x (2H + A) H] being the height sidewall and the width of the tire.

Une tringle est dite flexible lorsque, fléchie dans son plan autour d'une poulie de rayon 10mm, aucun des éléments rigides la constituant n'atteint une déformation permanente.A bead wire is said to be flexible when, bent in its plane around a pulley of radius 10 mm, none of the rigid elements constituting it reaches a permanent deformation.

Selon l'invention, une armature de sommet est inextensible lorsque l'effort, pour la déformer de 5%, est au moins égal à 40N, et une tringle est inextensible lorsque l'effort, pour l'allonger de 1%, est au moins égal à 2500N.According to the invention, a crown reinforcement is inextensible when the force, to deform it by 5%, is at least equal to 40N, and a bead wire is inextensible when the force, to lengthen it by 1%, is at less than 2500N.

Le pneumatique selon l'invention présente l'avantage de pouvoir augmenter de manière significative le nombre de pneumatiques par unité de volume lors du transport et/ou du stockage, entraînant ainsi un gain économique important.The tire according to the invention has the advantage of being able to significantly increase the number of tires per unit volume during transport and / or storage, thus resulting in a significant economic gain.

En effet, le mode de pliage selon l'invention permet un stockage de pneumatique avec un gain allant de 30 à 50% par m3 par rapport notamment au mode de conditionnement de type chaînage, explicité précédemment. Le pneumatique selon l'invention peut être plié, et stocké en vrac ou disposé dans une boîte.Indeed, the folding mode according to the invention allows tire storage with a gain ranging from 30 to 50% per m 3, in particular with respect to the chaining type conditioning mode, explained above. The tire according to the invention can be folded, and stored in bulk or arranged in a box.

Un autre avantage du pneumatique de l'invention est qu'il peut être soumis et conservé plié, quelle que soit sa taille. Enfin, le pneumatique selon l'invention peut rester plié le temps de son transport et/ou de son stockage sans aucun impact négatif sur ses performances.Another advantage of the tire of the invention is that it can be submitted and kept folded, regardless of its size. Finally, the tire according to the invention can remain folded during its transport and / or storage without any negative impact on its performance.

Un autre objet de l'invention est un procédé pour plier un pneumatique sous la forme d'une vrille, tel que définie précédemment, qui consiste à :

  • saisir simultanément le pneumatique à une première et une seconde extrémités d'un axe passant par le diamètre du pneumatique, et à
  • réaliser, selon ledit axe, une première rotation présentant un premier angle de rotation de la première extrémité et, au choix soit effectuer une seconde rotation présentant un second angle de rotation de la seconde extrémité, lesdites rotations étant effectuées en sens opposé, soit maintenir fixe la seconde extrémité.
Another object of the invention is a method for folding a tire in the form of a tendril, as defined above, which consists in:
  • simultaneously gripping the tire at first and second ends of an axis passing through the tire diameter, and
  • performing, according to said axis, a first rotation having a first angle of rotation of the first end and, optionally, performing a second rotation having a second angle of rotation of the second end, said rotations being effected in opposite directions, or fixed holding the second end.

La valeur absolue de l'addition du premier angle et de l'éventuel second angle de rotation est de préférence comprise entre 300° et 360°. Ceci est équivalent à une variation comprise entre 5/6 et 6/6 du premier et/ou du second pas d'hélice.The absolute value of the addition of the first angle and the possible second angle of rotation is preferably between 300 ° and 360 °. This is equivalent to a variation between 5/6 and 6/6 of the first and / or second helix pitch.

Enfin, l'invention a pour dernier objet une utilisation du pneumatique tel que défini précédemment pour véhicule de tourisme.Finally, the invention has the final object of using the tire as defined previously for a passenger vehicle.

De préférence, les premier et second pas d'hélice desdites première et seconde courbures sont identiques ou différents.Preferably, the first and second helical pitch of said first and second curvatures are the same or different.

Les premier et second pas d'hélice peuvent être compris entre 75 et 125% du diamètre du pneumatique. Ces valeurs de pourcentages sont de préférence obtenues au niveau de la ligne moyenne de la tringle.The first and second helical pitch may be between 75 and 125% of the tire diameter. These percentage values are preferably obtained at the average line of the bead wire.

De préférence, le pneumatique selon l'invention comprend un moyen de maintien dans la position pliée.Preferably, the tire according to the invention comprises a holding means in the folded position.

De préférence, le procédé de pliage consiste à appliquer en outre au moins un moyen de maintien en position plié, qui est de préférence appliqué au centre du pneumatique. Ce moyen peut être constitué par une sangle ou un feuillard de cerclage.Preferably, the folding method further comprises applying at least one folded position holding means, which is preferably applied to the center of the tire. This means can be constituted by a strap or a strapping strap.

L'invention va maintenant être illustrée à l'aide des différents modes de réalisation détaillés qui suivent, et qui ne limitent en aucune manière les objets de l'invention.

  • la figure 1 représente une vue schématique en trois dimensions d'un pneumatique non plié,
  • la figure 2 représente une vue schématique en trois dimensions d'un pneumatique dont le pliage a été initié, et
  • la figure 3 représente une vue schématique en trois dimensions d'un pneumatique plié,
  • la figure 4 représente une vue schématique d'un pneumatique plié selon la figure 3 avec différents plans axiaux perpendiculaires à l'axe XX', et
  • la figure 5 représente une vue schématique de l'encombrement bidimensionnel d'un pneumatique plié selon la figure 3.
The invention will now be illustrated with the aid of the various detailed embodiments which follow, and which in no way limit the objects of the invention.
  • the figure 1 represents a schematic three-dimensional view of an unfolded tire,
  • the figure 2 represents a schematic three-dimensional view of a tire whose folding has been initiated, and
  • the figure 3 represents a schematic three-dimensional view of a folded tire,
  • the figure 4 represents a schematic view of a tire folded according to the figure 3 with different axial planes perpendicular to the axis XX ', and
  • the figure 5 represents a schematic view of the two-dimensional bulk of a tire folded according to the figure 3 .

La figure 1 représente un pneumatique de véhicule de tourisme, de référence générale 1, non plié comprenant une bande de roulement 2 qui se prolonge radialement vers l'intérieur par deux flancs 3 reliés à deux bourrelets 4, lesdits bourrelets 4 comprenant une tringle (élément de renforcement) (non représenté).The figure 1 represents a passenger vehicle tire, of general reference 1, not folded comprising a tread 2 which extends radially inwards by two sidewalls 3 connected to two beads 4, said beads 4 comprising a bead wire (reinforcing element) (not shown)

Radialement à l'intérieur de ladite bande de roulement 2 se trouvent successivement une armature de sommet inextensible et une armature de carcasse (non représentées). Chaque bourrelet 4 comporte au moins une tringle. Cette tringle, qui définit une ligne moyenne formant une courbe fermée sensiblement circulaire dans un plan circonférentiel, est inextensible et flexible.Radially inside said tread 2 are successively an inextensible crown reinforcement and a carcass reinforcement (not shown). Each bead 4 comprises at least one bead wire. This rod, which defines a mean line forming a substantially circular closed curve in a circumferential plane, is inextensible and flexible.

La tringle est de préférence constituée en acier, et se présente sous la forme d'un câble saturé et non fretté, formé de filaments ; lesdits filaments étant d'un diamètre égale à 0,18mm. Le câble est un câble métallique 19.18 de formule (1+6+12), les couches étant formées avec le même sens de rotation et avec des pas identiques égaux à 10mm. Un tel câble autorise la formation d'une tringle par un enroulement de 3 à 16 tours. Le nombre de tours nécessaires est fonction de la dimension du pneumatique et de son usage.The bead wire is preferably made of steel, and is in the form of a saturated and unfilled cable, formed of filaments; said filaments being of a diameter equal to 0.18mm. The cable is a 19.18 metal cable of formula (1 + 6 + 12), the layers being formed with the same direction of rotation and with identical pitch equal to 10 mm. Such a cable allows the formation of a rod by a winding of 3 to 16 turns. The number of turns required is a function of the size of the tire and its use.

L'épaisseur moyenne EF du flanc du pneumatique selon l'invention, mesurée, au point situé au milieu selon la direction radiale entre le point haut de la tringle et le point bas du pneumatique sur le plan équatorial, est comprise entre 2,6 et 7mm.The average thickness E F of the sidewall of the tire according to the invention, measured at the point situated in the middle in the radial direction between the high point of the bead wire and the low point of the tire on the equatorial plane, is between 2.6 and 7mm.

L'épaisseur moyenne ES de l'armature de sommet 4, mesurée au plan équatorial, est comprise entre 2 et 7mm.The average thickness E S of the crown reinforcement 4, measured at the equatorial plane, is between 2 and 7 mm.

La figure 2 montre un pneumatique, par exemple de référence commerciale 185/65 R 14, dont le pliage a été initié, et la figure 3 montre le même pneumatique après pliage. Le pliage du pneumatique est effectué en saisissant tout d'abord deux extrémités, comprenant une portion de la bande de roulement 2 et une portion des flancs 3, lesdites extrémités étant diamétralement opposées et situées sur l'axe XX', ledit axe XX' correspondant au diamètre du pneumatique et passant donc par son centre.The figure 2 shows a tire, for example of commercial reference 185/65 R 14, whose folding has been initiated, and the figure 3 shows the same tire after folding. The folding of the tire is carried out by first grasping two ends, comprising a portion of the tread 2 and a portion of the sidewalls 3, said ends being diametrically opposite and located on the axis XX ', said corresponding axis XX' to the tire diameter and passing through its center.

On réalise ensuite deux rotations, de sens opposé, en ces deux points autour dudit axe XX'. La première rotation présente un premier angle et la seconde rotation présente un second angle. L'addition des valeurs absolues du premier et du second angle est de préférence égale à 300°.Two rotations are then made, in opposite directions, at these two points about said axis XX '. The first rotation has a first angle and the second rotation has a second angle. The addition of the absolute values of the first and second angles is preferably 300 °.

Après pliage, la ligne moyenne de la tringle (élément de renfort) présente dans le bourrelet 4, définit alors simultanément une première courbure, de référence générale 5 définie dans le plan équatorial, avec un premier pas d'hélice de 61cm tournant dans le sens triginométrique dans le plan axial, et une seconde courbure, de référence générale 6 définie dans le plan équatorial, avec un second pas d'hélice de 65cm tournant dans le sens antitriginométrique dans le plan axial.After folding, the average line of the rod (reinforcing element) present in the bead 4, then simultaneously defines a first curvature, of general reference 5 defined in the equatorial plane, with a first pitch of 61cm rotating in the direction triginometric in the axial plane, and a second curvature, of general reference 6 defined in the equatorial plane, with a second pitch of 65cm rotating in the antitriginometric direction in the axial plane.

Comme le montre la figure 4, trois plans axiaux A, B et C ont été représentés. Les plans axiaux A et C sont, respectivement, sensiblement disposés au niveau de la première courbure 5 et de la seconde courbure 6, et sont perpendiculaires à l'axe XX'. Le plan axial B, perpendiculaire à l'axe XX', est sensiblement disposé au niveau de la troisième courbure 7.As shown in figure 4 three axial planes A, B and C have been represented. The axial planes A and C are, respectively, substantially disposed at the first curvature 5 and the second curvature 6, and are perpendicular to the axis XX '. The axial plane B, perpendicular to the axis XX ', is substantially disposed at the level of the third curvature 7.

L'intersection de chacun des plans axiaux A, B et C avec le pneumatique plié permet de définir un encombrement bidimensionnel du pneumatique après son pliage selon l'invention.The intersection of each of the axial planes A, B and C with the folded tire makes it possible to define a two-dimensional space of the tire after its folding according to the invention.

Cet encombrement est défini en projetant sur chaque plan axial A, B et C la totalité de l'empreinte correspondante à l'emplacement dudit plan du pneumatique plié. De ces empreintes sont extraites uniquement toutes les parties convexes relatives au pneumatique plié.This size is defined by projecting on each axial plane A, B and C the entire corresponding cavity at the location of said plane of the folded tire. From these impressions are extracted only all the convex parts relating to the folded tire.

La figure 5 représente l'encombrement bidimensionnel de l'ensemble des parties convexes extraites et projetées sur chaque plan axial A, B et C du pneumatique plié. Comme on peut le voir sur cette figure, cet encombrement a une forme sensiblement rectangulaire.The figure 5 represents the two-dimensional space of all the convex portions extracted and projected on each axial plane A, B and C of the folded tire. As can be seen in this figure, this size has a substantially rectangular shape.

Le périmètre total de cet encombrement est obtenue par la formule : P < 3x(2H + L) avec L la largeur du pneumatique non plié, et H la hauteur de son flanc.The total perimeter of this bulk is obtained by the formula: P <3x (2H + L) with L the width of the unfolded tire, and H the height of its sidewall.

De préférence, P < 2,5x(2H + L).Preferably, P <2.5x (2H + L).

Claims (9)

  1. Collapsible tyre for a vehicle, comprising at least one carcass reinforcement optionally associated with an inextensible crown reinforcement, itself radially on the inside of a tread (2), said reinforcements each consisting of at least one layer of reinforcing elements, said tread being connected to two beads (4) by two sidewalls (3), said beads (4) being intended to come into contact with a rim, each bead (4) comprising at least one inextensible circumferential reinforcing element called a bead wire, said bead wire defining, when free of any stress, a mean line forming a substantially circular closed curve in a circumferential plane, said sidewalls having a thickness of between 2.6 and 7 mm and said crown reinforcement having a thickness of between 2 and 7 mm, characterized in that the bead wire of each bead is flexible, and in that after the tyre has been collapsed, the mean line of the bead wire simultaneously defines a first curvature (5) defined in the equatorial plane and having a first helix pitch extending anticlockwise in the axial plane, and a second curvature (6) defined in said equatorial plane and having a second helix pitch extending clockwise in said axial plane, the first and second curvatures being connected together by a third connecting curvature (7) defined in said equatorial plane, the projection of said first, second and third curvatures of the collapsed tyre onto an axial plane defining the two-dimensional envelope of said collapsed tyre by way of a total perimeter P of less than or equal to [3x(2H+A)], H being the height of the sidewall and A the width of the tyre.
  2. Tyre according to Claim 1, characterized in that the first and second helix pitches of said first and second curvatures are identical or different.
  3. Tyre according to either of Claims 1 and 2, characterized in that the first and second helix pitches are between 75 and 125% of the diameter of the tyre.
  4. Tyre according to one of the preceding claims, characterized in that it comprises a means for retaining the collapsed position.
  5. Collapsing method, characterized in that it consists in:
    - simultaneously grasping the tyre at a first and a second end of an axis passing through the diameter of the tyre, and in
    - carrying out, along said axis, a first rotation with a first angle of rotation of the first end and, depending on choice, either carrying out a second rotation with a second angle of rotation of the second end, said rotations being carried out in opposite directions, or keeping the second end fixed.
  6. Collapsing method according to Claim 5, characterized in that the result of the addition of the absolute values of the first angle and of said possible second angle of rotation is between 300° and 360°.
  7. Method according to either of Claims 5 and 6, characterized in that it consists in also applying at least one retaining means to the collapsed tyre.
  8. Method according to Claim 7, characterized in that the retaining means is applied to the centre of the collapsed tyre.
  9. Use of the tyre according to one of Claims 1 to 4 for a passenger vehicle.
EP13723116.3A 2012-05-24 2013-05-15 Foldable tyre, method and use Not-in-force EP2855168B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1254735A FR2990897B1 (en) 2012-05-24 2012-05-24 PNEUMATIC FOLDABLE, METHOD, USE
PCT/EP2013/060008 WO2013174687A1 (en) 2012-05-24 2013-05-15 Foldable tyre, method and use

Publications (2)

Publication Number Publication Date
EP2855168A1 EP2855168A1 (en) 2015-04-08
EP2855168B1 true EP2855168B1 (en) 2016-05-04

Family

ID=48446338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13723116.3A Not-in-force EP2855168B1 (en) 2012-05-24 2013-05-15 Foldable tyre, method and use

Country Status (9)

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US (1) US9889704B2 (en)
EP (1) EP2855168B1 (en)
JP (1) JP6261013B2 (en)
CN (1) CN104321203B (en)
BR (1) BR112014029292A2 (en)
FR (1) FR2990897B1 (en)
IN (1) IN2014DN09566A (en)
RU (1) RU2014152269A (en)
WO (1) WO2013174687A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2977828B1 (en) * 2011-07-13 2013-08-16 Michelin Soc Tech PNEUMATIC FOLDING MACHINE, FOLDING METHOD AND USE
FR2990897B1 (en) * 2012-05-24 2014-05-09 Michelin & Cie PNEUMATIC FOLDABLE, METHOD, USE

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3139135A (en) * 1964-06-30 Frisby
US3570572A (en) * 1968-12-23 1971-03-16 Goodrich Co B F Collapsible tire
US3833042A (en) * 1971-07-26 1974-09-03 Goodyear Tire & Rubber Pneumatic tire
JPS5222204A (en) * 1975-08-13 1977-02-19 Shigemasa Takagi Foldable bead for a tire
US4177851A (en) * 1976-03-15 1979-12-11 The Goodyear Tire & Rubber Company Foldable spare tire
US4057091A (en) * 1976-04-07 1977-11-08 The Firestone Tire & Rubber Company Pneumatic tire
JPS52126804A (en) 1976-04-15 1977-10-25 Bridgestone Corp Foldable tire
FR2427916A1 (en) * 1978-06-05 1980-01-04 Michelin & Cie RADIAL CARCASE SPARE TIRE
JPH02139447A (en) * 1988-11-21 1990-05-29 Atsushi Kitamura Cylindrical seamless woven fabric and loop-like processed article thereof
US5685927A (en) * 1992-09-30 1997-11-11 The Goodyear Tire & Rubber Company Run-flat tire with wet handling design
JP3340499B2 (en) * 1993-03-29 2002-11-05 株式会社ブリヂストン Pneumatic radial tire
US6367528B1 (en) * 2000-02-28 2002-04-09 The Goodyear Tire & Rubber Company Tire deflection alarm
US6345655B1 (en) * 2000-03-06 2002-02-12 Lockheed Martin Corporation Storable tire assembly for a vehicle
US20030150538A1 (en) * 2001-02-28 2003-08-14 Renato Ceretta Tyre for a vehicle wheels with self support-functions, and a rim for said tyre
FR2942746B1 (en) 2009-03-04 2011-02-25 Michelin Soc Tech PNEUMATIC FOR BICYCLE.
US20120298278A1 (en) * 2011-05-25 2012-11-29 Thomas Allen Wright Carcass ply structure for a pneumatic tire
FR2977828B1 (en) * 2011-07-13 2013-08-16 Michelin Soc Tech PNEUMATIC FOLDING MACHINE, FOLDING METHOD AND USE
FR2990897B1 (en) * 2012-05-24 2014-05-09 Michelin & Cie PNEUMATIC FOLDABLE, METHOD, USE
FR2992588B1 (en) * 2012-06-27 2016-08-05 Michelin & Cie PNEUMATIC FOLDING MACHINE, FOLDING METHOD AND USE

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Publication number Publication date
WO2013174687A1 (en) 2013-11-28
CN104321203A (en) 2015-01-28
JP6261013B2 (en) 2018-01-17
US9889704B2 (en) 2018-02-13
BR112014029292A2 (en) 2018-04-17
EP2855168A1 (en) 2015-04-08
US20150144272A1 (en) 2015-05-28
JP2015517436A (en) 2015-06-22
CN104321203B (en) 2016-11-09
IN2014DN09566A (en) 2015-07-17
FR2990897A1 (en) 2013-11-29
RU2014152269A (en) 2016-07-20
FR2990897B1 (en) 2014-05-09

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